First you must check the datasheet of the transistor in question and identify the values vbe vce and hfe. How to calculate the base current i b of a transistor. How To Use A Transistor As A Switch Nuts Volts Magazine What Is The Ideal Resistance For A 2n3904 Base Resistor Transistor Base Resistor Calculator Kaizer Power Electronics There are several ways to find the base current ib of a transistorand it all depends on what information is already known about the transistor. Calculate base resistor npn transistor . The current gain beta hfe is a value you can find in the datasheet for the specific trans. I have a 12v led strip that draws 120ma and i want to control it with a bs2 and a npn transistor eg. A bipolar junction transistor is a solid state device in which the current flow between two terminals the collector and the emitter is controlled by the amount...
